LrNNEAN SOCIETY OF LONDON. 2$ 



may be described iu the case of each day as uuits, hundreds 

 thousands, and tens oi: thousands — or thereabouts. 



Diatoms. Dinoflagellates. Copepods. Fish-Eggs. 



April 9 100,000 1000 250 2 



April 10 90,000 2000 780 8 



As another example of the same run of figures in these groups 

 we note that in a surface haul, W. of the Calf Island, on 

 March 29th, the total 



Diatoms amount to 72,650 



Dinoflagellates „ 3,500 



Copepoda „ 363 



Fish-Egffs , 93 



-oo"- 



Generally speaking these proportions hold good for many of the 

 series of hauls not only in the Bay, but also from the open sea 

 outside. Fig. 1 shows by the proportions of the squares the 



Fig. 1. — Diagram showing maximum haul in the year. 



JJlATOMS 





numbers contained in the greatest hauls of Diatoms, Copepods, 

 Dinoflagellata, Oikopleura, and Sagitta, respectively. 



Lists compiled from the gatherings and curves drawn from these 

 hsts show that, as a consequence of the three factors noted above, 

 certain groups and certain prominent species differ from one 

 another greatly in their relative abundance throughout the months 

 of the year (see fig. 2, p. 24). 



Thus, the Diatoms take on an enormous development in early 

 spring, and reach their maximum in April, then die down during 

 the summer, and may rise again to a second but much less 

 important and less constant maximum in autumn (fig. 3, p. 24). 

 It must be borne in mind, however, that the species, and to some 



